Table 2.

Overview of the modified membranes and the pHEMA and spiropyran content.

Membrane	cHEMA (vol%)	Polymerization time (min)	Poly(HEMA) content (%)a	SP content (%)b	FRLc	FUVc	ΔF (%)d
0.2 μm	0	0	0	0	1.6	-e	–
0.2 μm	0.2	1200	0.38	-e	6.2	9.3	50
0.2 μm	1	1200	3.2	-e	8.9	10	13
0.2 μm	10	15	12	-e	0.96	1.2	30
0.2 μm	10	60	19	-e	0f	1.3	>103
0.2 μm	10	120	25	3.2	-e	-e	–
0.2 μm	10	240	28	-e	0f	0.11	>103
0.2 μm	10	1200	31	-e	0.031	0.19	530
0.2 μm	25	1200	48	3.5	0.41	0.49	20
1 μm	0	0	0	0	40	-e	–
1 μm	10	1200	17	5.7	4.8	6.1	27
1 μm	25	1200	31	8.8	0.21	0.34	62
2 μm	0	0	0	0	39	-e	–
2 μm	10	1200	4.9	3.9	9.0	14	56
2 μm	25	1200	7.2	3.5	1.4	1.6	14

^aDetermined by measuring the average membrane mass before and after polymerization.

^bDetermined by decomposing of the spiropyran in the membrane and measuring the concentration of 2-hydroxy-5-nitrobenzaldehyde (decomposition product).

^cUnits: 10⁻⁹ mol s⁻¹ cm⁻².

^d ΔF = 100 (F_UV − F_RL)/F_RL.

^eWas not determined.

^fPermeability below detection limit.